Bathtub



FIG. 1 is an elevational view taken from one side of a bathtub showing my new design, the opposite side being the same as the side shown;

FIG. 2 is a top plan view thereof;

FIG. 3 is an elevational view taken from one end thereof, the opposite end being the same as the end shown; and

FIG. 4 is a perspective view taken from the top, one side and one end thereof. 

The ornamental design for a bathtub, as shown and described. 